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/usr/include/bobcat/x2a is in libbobcat-dev 4.04.00-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#ifndef INCLUDED_BOBCAT_X2A_
#define INCLUDED_BOBCAT_X2A_

#include <sstream>
#include <string>

namespace FBB
{
class X2a: public std::ostringstream
{
    static bool s_lastFail;

    public:
        template <typename T>                   // initialize from 
        X2a(T const &x);                        // (insertable) type       1.f

        X2a(X2a const &other);                                          // 2.f

        X2a(double x, size_t behind);
        X2a(double x, size_t width, size_t behind);

        X2a &operator=(X2a const &rhs);                         // opassign.f
        operator std::string const() const;                     // opstring.f

        bool lastFail();                                                // .f
};

template <typename T>                   // initialize from 
inline X2a::X2a(T const &x)             // (insertable) type
{
    s_lastFail = (*this << x).fail();
}
inline X2a::X2a(X2a const &other)
:
    std::ostringstream(other.str())
{}
inline X2a::operator std::string const() const
{
    return str();
}
inline X2a &X2a::operator=(X2a const &rhs)
{
    str(rhs.str());
    return *this;
}
inline bool X2a::lastFail()
{
    return s_lastFail;
}

    // Free Functions

inline std::ostream &operator<<(std::ostream &ostr, X2a const &x2a)
{
    return ostr << x2a.str();
}

} // FBB

#endif